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How to Flatten a nested list in python

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OHIOLee answered on June 7, 2020 Popularity 10/10 Helpfulness 4/10

answer How to Flatten a nested list in python

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How to Flatten a nested list in python

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import itertools

a=[[1, 2, 3], [4, 5, 6]]

flat_list = list(itertools.chain.from_iterable(a))
print(flat_list)

# Output:
[1, 2, 3, 4, 5, 6]

Popularity 10/10 Helpfulness 4/10 Language python

Source: Grepper

Tags: flatten list nested python

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Contributed on Jul 07 2022

OHIOLee

0 Answers Avg Quality 2/10

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python unlist flatten nested lists

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def flatten(x):
    if isinstance(x, list):
        return [a for i in x for a in flatten(i)]
    else:
        return [x]

Popularity 9/10 Helpfulness 7/10 Language python

Source: Grepper

Tags: flatten

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Contributed on May 17 2021

Combative Crocodile

0 Answers Avg Quality 2/10

make a nested list flat python

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def flatten(t):
    return [item for sublist in t for item in sublist]

Popularity 8/10 Helpfulness 5/10 Language python

Source: stackoverflow.com

Tags: flat list

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Contributed on Aug 27 2021

Agreeable Alligator

0 Answers Avg Quality 2/10

python nested list

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# example of a nested list
my_list = [[1, 2], ["one", "two"]]

# accessing a nested list
my_list[1][0] # outputs "one"

Popularity 10/10 Helpfulness 4/10 Language python

Source: Grepper

Tags: list

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Contributed on Jun 07 2020

Attractive Aardvark

0 Answers Avg Quality 2/10

flatten nested list in python

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# you can flatten nested list recursively like this
eg = [1,[2,[3,[4,[5,6,7]]]]]

all_item = []
def flatten_lst(nested_lst, all_val=[]):
    global all_item
    for item in nested_lst:
        if isinstance(item, list):
            return flatten_lst(item, all_item)
        if item:
            all_item.append(item)

flatten_lst(eg)
all_item

Popularity 7/10 Helpfulness 2/10 Language python

Source: buggyprogrammer.com

Tags: flatten list nested ne

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Contributed on Dec 22 2022

Darkstar

0 Answers Avg Quality 2/10

python nested list

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L = [[1, 2, 3],[4, 5, 6],[7, 8, 9]]   
for list in L:
    for number in list:
        print(number, end=' ')
# Prints 1 2 3 4 5 6 7 8 9

Popularity 10/10 Helpfulness 2/10 Language python

Source: www.learnbyexample.org

Tags: list

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Contributed on Jan 04 2021

Homeless Herring

0 Answers Avg Quality 2/10

how to make one list from nested list

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-1

>>> from collections import Iterable
def flatten(lis):
     for item in lis:
         if isinstance(item, Iterable) and not isinstance(item, str):
             for x in flatten(item):
                 yield x
         else:        
             yield item

>>> lis = [1,[2,2,2],4]
>>> list(flatten(lis))
[1, 2, 2, 2, 4]
>>> list(flatten([[1, 2, 3], [4, 5, 6], [7, 8, 9]]))
[1, 2, 3, 4, 5, 6, 7, 8, 9]

Popularity 10/10 Helpfulness 1/10 Language python

Source: stackoverflow.com

Tags: list

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Contributed on Sep 02 2020

Shiny Seahorse

0 Answers Avg Quality 2/10

List Nested Lists

Comment

-1

x = [3, 4, [7, 8]]
print(x[2][1])
# 8

Popularity 9/10 Helpfulness 1/10 Language python

Source: xahlee.info

Tags: list

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Contributed on Dec 10 2021

Sore Sloth

0 Answers Avg Quality 2/10

nested list in pthon

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-2

n=int(input())
res=[]
grade=[]
for i in range(n):
    name=input()
    mark=float(input())
    res.append([name,mark])
    grade.append(mark)   #calculation 2nd lowest
#print(res)   
#print(grade)
grade=sorted(set(grade))  #sorted unique
#print(grade)
m=grade[1]
#print(m)
name=[]
for val in res:
    if m==val[1]:
        name.append(val[0])
#print(name)   #unsorted     
name.sort()
#print(name)   #sorted
for nm in name:
    print(nm)

Popularity 9/10 Helpfulness 1/10 Language python

Source: letstacle.com

Tags: list

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Contributed on Jan 10 2022

Talented Tiger

0 Answers Avg Quality 2/10

How to Flatten a nested list in python

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